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%I #4 Mar 30 2012 18:52:12
%S 2,4,6,7,8,11,12,13,17,19,20,23,24,29,31,37,38,41,42,43
%N If n is prime, a(n) is next composite greater than a(n-1), else if n is composite, a(n) is next prime greater than a(n-1) else 2.
%e 1 is not prime, a(1)=2, 2 is prime, a(2)=4, 3 is prime, a(3)=6, 4 is composite, a(4)=7.
%Y Cf. A159559
%K nonn
%O 1,1
%A _Gerald Hillier_, Jul 31 2009
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